To my mind the concepts of the finite and the infinite are equally mysterious.
But recently I was surprised to encounter the view that infinity may be something different from what I have instinctively thought it to be.
So in view of Plato's pythagorean background, is it true that he viewed infinity as something incomplete and imperfect, therefore unsuitable for being an attribute of God, the Demiurge?
Moreover, that it was Christianity that deeply altered the mentality towards infinity, making it an essential attribute of God? And how does it all relate to Aristotle's God as "actual" infinity, and to the fact that the infinite is always present in finite things in the form of infinite divisibility?
I hope the question is not too broad for a concise answer.
Maybe it all amounts to whether "actual infinity" is something real and not just wordplay.
Basically I'm asking for guidance for efficiently studying the history of the subject.
EDIT: So the title of the question asks whether "the infinite" is a mental construct that, although present in our minds, should not be linked to external objects with the same force & intensity that we use when we link them to "the finite", or even not at all, despite the fact that the open space surrounding us formidably suggests the idea of "infinite expansion".